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Joined: Feb 2004
Posts: 26,991
Kettle Custodian (pot stirrer)
Got a question about tool post grinders! I'm grinding a piece of 3" diameter thick wall steel tubing between centers in my lathe. Should the workpiece be turning the same direction as the grinding wheel, or opposite its rotation? Surface finish isn't as big a consideration as the need to maintain a more accurate diameter than I can get with a carbide tool bit- - - -I'm looking for +/- .0005 or so.


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Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
Jerry, According to this, they should both be turning the same direction, so that the grinding wheel is moving opposite the workpiece direction at the contact point.

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Kevin is right! The contact point should be running in opposite directions.


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I agree with both Kevin and Don. If they weren’t running in the same direction (both clockwise or counter clockwise) the speed of the wheel would be effectively be reduced.

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